(20 U.S.C. 6301 et. seq.), as amended by this Act, from programs. authorized under the Elementary and Secondary Education Act. of 1965 (20 U.S.C. 6301 et seq.), as in effect on the day before. the date of enactment of this Act.
The efficacy of a vaccine is different from its effectiveness. It is dependent on several factors such as: 1  adherence to vaccine schedules. 2  the disease â some diseases have vaccines against them that perform better than for other diseases. 3  the strain of vaccine â some vaccine strains are more effective than others.
The United States currently has the safest, most effective vaccines in its history. 1  Federal regulations require that vaccines undergo years of testing before they can be licensed. Once in use, vaccines are monitored continually for safety and efficacy. As an immunization provider, you also play a key role in helping to ensure the safety and efficacy of vaccines through proper: Vaccine storage and handling; Vaccine administration